Blue dye.



UNITED STATES PATENT or" WILHEL BAUER, or VOI-IWINKEL, AND ALFRED Renee, or ELBERFELD, GERMANY, nssrenons To FARBENFABRIKEN VOBM. FRIEDR. BAYER & 00:, or ELZBERFELD,

GERMAN Y, A CORPORATION -or GERMANY.

BLUE DYE.

lie-Drawing. Application filed November To all whom ii -may concern:

Be it known-that we, WILHELM ALFRED HERRE, doctors'of philosophy,cheni- 1sts, c1t1zens of the Grermanv Empire, resid I which the following isa specification". I

This application relates to' the manufacture and production of specific new and a-L ivable rat dyestufis. They are obtained by condenei g halogen substituted isat'in derivatives COlXtftlIllllgi-llG halogen in the hen- .zene nucleus in. which the oxygen of the ubl'e in hot benzene with a pure blue and.

- generally with a alplie lreto group is replaced by easily mov;

I able er replaceable substituents, gen,j,. sul fn'r, the amino group, the elkoxy' Another epplication Se1'ial No.'516685 wev with i-ethoxy-l naphthol, While in describe-the whole class to which these dyeloelong.

The new'dyes are" inl'a, riry state dark blue crystalline powders. with a metallieluse ter which are soluble. in hot nitro'benzene blue coloration, and which field with hydrosnlfite andcaustic soda lye iits dyeing cotton after exposure to air blue sliedes remarkable for their tastness. to .cli lorin.

order to illustrate the new process more. fully We can proceed as follows -the tarts being by weight 1OO parts. of 'dibro- I nioisatin are converted in a 'dry' -.sgispension into benzene dibromoieatin chloridby tieating-it with 72-'parts"PCl v-'.Ihe -n1 ixtiure thus obtained is then pouredinto a solution which is well stirred of parts of ethoxy-l-naphthol in dry benzene; The

stirring ,is continuedfor eshort time and the dye =Wl1i0h separates on. cooling is filtered olf and Washed. It is a dark blue .crystallinepowder with, a'o'opp'er luster solin concentrated sulfuric acid with :i green coloration. Ityiel'ds with hydrcsul-fite and BAUER and v Specification L tters Y n Patented June 14, 1910.

Serial No. 529,516.

NQLOH yellow vat from which cotton is dyed yellow changiugon exposure; to air into a fast clear binciast to ehlorin,

lnsteadof'the above isatin derivatives others may be used, gt chimebronio-, chlorobroino er dichloro-isatin chlorid, ortho-broino-parn-niethylisetiijn ehlorid, tribromo ieatin ciilorid, pare;- brorne ortho methyl-isa-tin chlorid, etc, etc.

We claim:- 1'. The herein described new dyestnii's obtainable from a halogen. eul'istituted ieetin derirative containing the halogen in the benzene nucleus in which the, oxygen of 'the' alpha-ketc group is replaced by easily movable or replaceable substituents and ethoxy-l-napl-ithoh which dyestuffs arein a dry-state dark blue crystalline peWde-rs with a' metallic luster which are soluble in hot nitrobenzen-e generally with e blue colorar tion, and which yield withhydrosuliite and caustic soda lye vets dyeing cotton attereigposure to :T'r bhie shedesremarkable for their fastness to chlorin; substantially es de scribed.

I in a dry state a dark blue cryste-liine powder Witha. copper luster, vsoluble in hot ben. zene with. a, pure blue and in concentrated sulfuric acid with a" green coleretion, and which yields with hydrosulfite and caustic soda lye a yellow vatflfroin which veo'ttoi'i is dyed yellow changing on exposure-t'ojair 2. The herein described newwiyeetufi 0binto a clear blue remarkable for its 'fastness I to chlcrin, substantially as described. I

set our. hands in the presence of two subscribing Witnesses. I

WILHELM' BAUER, [Lush] v ALFRED HERRE. [us] Witnesses:

Orro KoNre, I GiiAs. J. VVRIGH'L- 'In testimony: whereof We have hereunto- 

